java - 用于删除内部双引号的正则表达式

Question

我有一个带有外部双引号的字符串""。我需要删除内部双引号。这个的正则表达式是什么？

例如:

input: "Hello there "I arrive" tonight" ---> output: "Hello there I arrive tonight"
input: "Hello there "I arrive tonight"" ---> output: "Hello there I arrive tonight"
input: ""Hello" there I arrive tonight" ---> output: "Hello there I arrive tonight"

我尝试了以下代码，但它不适用于我的示例 2 和 3。它适用于示例 1。

data.replaceAll("\"(\\b[^\"]+)?\"\\b([^\"]+)\\b\"([^\"]+\\b)?\"","\"$1$2$3\"");

背景:我有一个 CSV 文件，需要解析它。数据带有外引号内的内引号。例如:

"aa","bb","cc","dd "REMOVE QUOTES" "
"aaa","bbb","ccc",""REMOVE QUOTES" ddd "

我希望正则表达式仅删除内部引号并保留外部引号。输出:

"aa","bb","cc","dd REMOVE QUOTES "
"aaa","bbb","ccc","REMOVE QUOTES ddd "

Answer 1

您可以结合使用负向后看和向前看:

data = data.replaceAll("(?<!^)\"(?!$)", "")

• (?<!^)行开头的负向后查找
• (?!$)负向预测 EOL